Quiz1-1Bb_w_solns

# Quiz1-1Bb_w_solns - Department of Physics, UCSD Winter 2009...

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Unformatted text preview: Department of Physics, UCSD Winter 2009 Physics 1B(b) Prof. Dimitri Basov Quiz 1, January 23 (Version A) 1. The diagram shows the electric-field lines for two point charges q 1 and q 2 separated by a small distance. Determine the ratio q 1 /q 2 and the signs of q 1 and q 2 . (a) q 1 /q 2 =- 1 / 3; q 2 &gt; 0; q 1 &lt; (b) q 1 /q 2 = 1 / 3; q 2 &gt; 0; q 1 &gt; (c) q 1 /q 2 =- 2 / 3; q 2 &gt; 0; q 1 &gt; (d) q 1 /q 2 = 2 / 3; q 2 &gt; 0; q 1 &gt; (e) q 1 /q 2 =- 3; q 2 &gt; 0; q 1 &lt; 2. An electron is released a short distance above Earths surface. A second electron, directly below it, exerts an electrostatic force on the first electron big enough to exactly cancel the gravitational force on it. How far below the first electron is the second one? (a) 2 m (b) 3 m (c) 4 m (d) 5 m (e) 6 m 3. A charge q 1 = 6 . 00 10- 9 C and a charge q 2 =- 3 . 00 10- 9 C are separated by a distance of 60.0 cm ( q 1 is on the left). What is the position at which a charge of 12 . 00 10- 9 C has to be placed so that the net electrostatic force on it is zero?C has to be placed so that the net electrostatic force on it is zero?...
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## This note was uploaded on 03/21/2009 for the course PHYS PHYS 1B taught by Professor Berman during the Winter '09 term at UCSD.

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Quiz1-1Bb_w_solns - Department of Physics, UCSD Winter 2009...

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